Control system



Sept. 11, 1928.

E. F. Buss CONTROL sYsTmTa Filed Aug. 14, 1924 Inventor": ElmerFBliss,

H is Attorney.

Puma Sept- 11,1928.

UNITED? STATES.

PATENT oFF-l'cn.

m r. mass, or mun s, New You, assrenon- 1-0 mm mnc'rnro 001mm,

, n conrourronor NEW YORK oonrnor. srsrm Application filed iiu m 14, 192 Serial Io. 732,079.31

are arranged to operate in alpredeterminedsequence to effect the operation of the plant automatically upon thc. occurrence of a prerate source offcurrent has to be determined condition either at the at some remote point. V

In order that the electroresponsive devices may be operated to-efiect the starting-of the plant,- when the plant-is-shut down, a sepa 'ovided for energizing the electroresponsive. devices. This separate source; may be eithen at the dynamo-electric, plant or at some Eremote point which is connected to the plant by a control circuit. Sometimes it is desirable to control over this same control circuit some other condition of the plant than the starting thereof, such, ior example, as the output,

of the; plant after it has been In orderthat this additional control may be ef fected over the same control circuit that the a starting thereof is effected, it is necessary'toarrange the circuits of the electroresponsive devices of the automatic switching equipment so that theycanbe energized from some,

other source, such as the dynamo-electric machine of the prime mover dynamo-electric plant, after the plant has beenstarteda One object of my invention is to provide a sys the lantafter ithas heen started. l6 v i vention will understood tem ofcontrol whereby the electroresponslve devices of an automatic switching "equipment fora prime moverdyhamo-electiic plant are energized independently of the separate source and the COIltIOlCllClllt connecting the devices to the separate source as soon as there is a suitable voltage available at the plant for energizing the deviceswhen the plantis started i f Another object of my invention'is to provide in a systemiof remote control for an automatic prime jmover dynamo-electric plant an'arrange'ment whereby thesame' con- V trol circuit n'rayhe used to effect the starting of the plant from a remote-point when the plant is shut down and to vary the output of plant or to stop the water-wheel.

from the following description, taken in connection with the accompanyin drawing, which shows one embodiment of m'y inven tion, and its scope will be pointed out in the 4 switch 5 .is'arranged to connect one side of a separate source of current, shown as abattery 6, to a pilot wire 7 to which are connected the starting coil 8 of the governor magnet 9 and the field winding 10 and armature winding 11 of the synchronizing motor 12 and alternativel .to a pilot-wire 13 to which the field win g 14 and armature 11,

of the synchronizing motor 12 are connected. The'other s de of the battery 6 is connected to the starting coil 8, and the windings of the motor 12 by means of the ilot wire 18 and various contacts which wi he hereinafter described, g

' The governor magnet 9 is arranged in an suitable manner, examples of whic are wel 1 lrnown in the art so that when the magnet 9 is energized while the plant is shut down, the gate 15 which controls the supply of water to the vwate r-whmal 2 is opened to effect the starting of'the water-wheel, and when the magnet 9 is deenergized the gate 15 is closed As shown in the drawing, the magnet 9 when energized effects the operation of the pilot valve 16,

'which'controls the operation of the gate 15 to efiect the: opening of the gate. This movement of the pilot valve is opposed by a spring 17 which moves the pilot valve 16 to effect the closing of'the gate whenever the magnet 9 is deenergiz'ed' v w i 20 is a speed governor which controls the position ofthe pilot valve in response to the (speed of the plant. The over'nor 20 and magnet 9 are so arranged t at the governor is operative to control the gate opening only when the magnet is energized.

The synchronizing motor '12 is arrangedin any suitable manner, examples of which are welLknown in'the art whereby rotating the otor 12 in one direction'varies the setting of the governor so that the output of the inc plant is increased and rotating the motor 12 l m the opposite direction varies the settin of the governor so that the output of the p antis decreased. As shown in the'drawing, the rotation of the motor 12 varies within limits determined by the limit switches 21 and 22, the length of the operating rod 23 of the overnor 20. When the circuit through the held winding 10 ofthemotor 12 is completed the motor 12 operates in a direction to increase the output of the plant, and when the circuit through the field winding 14: is completed the motor 12 operates in a direction to decrease the output of the plant.

Since the electroresponsive devices of the automatic switching equipmentior controlling the electrical connections of the gen erator and the exciter form no essential part of my invention and may be of any desirable type, examples of which are well- -known in the art, these devices have been omitted in order to simplify the drawing.

In automatic switching equipments for prime mover dynamo-electric plants, it iscustomary to provide a plurality of protective devices which are arranged to effect the shutting down of the plant'upon the occurrence "of certainpredetermined abnormal conditions. This result is usually accomplished by the protectiv devicesoperating contacts in the circuits of one or more of the electrorespon'sive devicw of the automatic switching equipment, the contacts being arranged so that after being operated y the respective protective devices they have to be reset. by hand before-the automatic switchin equip cm; can fimction gain to effect t e start' g of the plant. In

t 0 drawing, the contacts 25 represent a plurality of such contacts whichmay be opened respectively by suitable means, not shown,

' when certain predetermined abnormal condltions occur. These contacts 25 are connected in till; lpircuit of the cot: 8l Ofatm m et 9w'c is'lmlftd in cose th e c sbntrol switch. 5' so tat in case any onz of the contacts 25 has been opened, "the circuit of the wit 8- cannot be completed until the contacts- 25,,which are open, have reset manually. In this manner proafter the occurrence provi ed until the plant has been m spec' ted. In order; to decrease the output of the plant 1 by means of the control switch 5, 1t is n to open the circuit through the pilot wire 7 and close the circuit, through the pilot wire 13. In order to prevent-t e magnet 9 from being deenergized when the switch 5 is movedout of mentwith contact 30 the magnet 9 is arranged to bebattery 6 through the control switch 5,.'contection against. of a etermined a normal condition is .across the exciter A by theexciter voltage relays 27 and 28, when the exciter voltage exceeds a predetermined value. The relays 27 and 28 are alsoarranged so that when they operate they open the circuit of the starting coil 8 and connect the contacts 25 of the protective devices in the circuit of the holding coil 26. Therefore if any lane of the protective devices is operated .while the plant is in operation the magnet 9 is deenergized to effect the shutting down of the plant. Y WhileIhave shown the magnet'9 as having two coils, one of which is energized to effect the starting of the plant and the other one of which is energized after the plant has reached a predetermined condition, which in the arrangement shown' is the exciter voltage building up to a predetermined value, it is obviousto one skilled inthe "art that many other suitable arrangements may be used to effect the energization of the magnet 9 independently. of the control circuit after the plant has been started. Therefore, I do not wish it to be understood that my invention is limited to. the particular arrangement shown and described.

' The operationof the arrangement shown is as follows: When the plant is shut down the control apparatus 1s in the position shown. Whdn it is desired to start the plant the control switch 5 is operated so that it engages contact 30 thereby completing, a circuit from the positive terminal of the tact 30, pilot wire 7 limit switch 22, starting winding 8 of'the governor magnet 9 and contacts 31 of the relay 27 which are in parallel with the field winding-'10 and ar-. mature winding of the synchronizing motor 12 and the contacts 32 of the relay 27, all of thecontacts 25 in series, contacts 33 of the relay 28, pilot wire 18 to the negative terminal of the battery 6. The motor' .12 operates to increase the len h of the rod- 23 and the energization of t e coil 8 ulls the'plunger of the magnet 9 down. of these operations tend tomove the plunger ofthe pilot valvedownward thereb efi'ect ing the opening of'gate 15. After the gates have been opened" a small amount, the water-wheel starts and accelerates rapidly until substantially normal speed is reached, when the governor 20 operates, to pilot valve 16 so as to maintain thegate openin at the proper amount-to hold the desir speed. Meanwhile, the electrore sponsive evices (not shown) of the auto matic switching so as to establish t e desired electrical connections of the plant. As soon as the voltage of the exciter 4.- builds up to a predetermined value, .when

the plant is started, the relays 27 and 28, whic are connected across the exciter, oper- Iii move'the uipment are functioning -1 ace ate across the exciter which includes the holding coil 26 and all of. the g 4 The circuit of the ho ding coil 26' is from rotective contacts 25;

the positive side of the-'exciter i4,through ii the holding coil 26, of the magnet 9, contacts 35 of the relay 27, all of the contacts 25 in series, contacts 36 of the relay 28 to the negative terminal of the exciter. The holding coil 26 therefore is energized independently of the control circuit 7 so that this control circuit 7 may be opened and the switch 5"moved so as to engage contact 37 to rotate the motor 12 in the opposite direction to decrease the output of the plant with out deenergizing the ma 7 the shutting down of-t e .plant:' In order a that the motor 12 may be operated inde et 9 and effecting pendently of the, protective contacts after the plant has been started, the relay 27 is provided with the contacts 39 which connect the armature winding 11 ofthe -motorfd1- rectl to the pilot wire 18.

A ter the plant has been started, the output may be varied to any desired value within predetermined limits by operating the governor rod 23.

Whenit is. desired to shut'the'plant down the control switch- 5 is moved: into engage- 'motor 12 so as to vary the length-ofthe -ment with the contact'37 and left there "so that the motor 12 will decrease thelen'gth I i of the 'rod 23 i ntil'the limit switch 21 in v v .sald auxillary source of current, electrothe circuit of the 'motor is opened. n The governor is so arranged that. when the length of the'gove'rnor rod 23 has been decreased this amount, the openingof the i gate 15 is so small that the water-wheelstarted up again .from the remote point.

.rotates at such a very 'low speed'thatfthe holding coil 26 of the magnet 9 is not sufiiciently energized to hold attracted the core of the magnet 9. Therefore, the spring 17 ing of the gate 15. After the plant has been shutdown in this manner, it is necessary for the switch5-to be moved into engagement with the contact 30 betore it can be i If, while the plant is in operation, 1 an abnormal condition occursfwhereby some of the contacts 25 are c ened, theopening of these contacts opens t e circuit of the holding coil 26% whereup'onthe pilot'valve 16 is tact's 25 are connected in thecircuit of the.

operated b the s ring 17 to close the gate and shut own ,t e plant. Since the constartingicoil 8. when the plant is shut down it is impossible to start the plant by means of the control switch 5 aftersuch a shut down until the open contapts 25. have been manually reset.

While I have in accordance with the patent statutes, shown and described my in- Ventionas applied to a particularsystem', meansiresponsive to a-predetermined elecfications as fall within'the true and as embodyingvarious devices dia ammaticall indicated, changes and m ificaby Letters Patent of the United States, is

11. In combination, an automatic station comprising a source of current and autotions wi 1 be obvious.to those skilled in the matic control. means therefore, a remote control station, a control circuit connecting saidstations, an auxiliary'sourceofcurrent,

switching means at said remote control stati-on for controlling the energization of said control circuit from said auxiliary source of current, electroresponsive means at said automatic station connected to said contrdl cllclllt and arranged, when energized, to

effect the operation of sand automatic control means to start said automatic 1 station and maintain it in operation; and means responsive to a predetermined conditionof said automatic" station for disconnecting said electroresponsive means from said aux- Y iliarysource and for completing another energizing circuit therefor which is independent'of said auxiliarysource; I i 2..In combination, an automatic prime mover d namo electric plant,-av remote con-' I trol station therefor, an auxiliary source of current a control circuit extending between said plant and said station and including responsive means at said plant connected to said control circuit whensa'id plant is shut down and arranged when energizedtoefi'ect i the starting of said plant, switching means at said remote control station for controlling the energization of said controlcircuit, and means responsive to a predetermined electricalcondition of Said plant for disconnecting said el'ectroresponsivemeans from said auxiliary source and completinganother energizing circuit therefor, which is independent of said auxiliary. source.

' 3. In combination, an automatic rime mover dynamo electric plant comprismgua prime mover'and a dynamo electric machine arranged .to be driven -thereby, a remote it control station for said plant, a control cir- 'cuit extending between said plant and said (station, an auxiliary source of currentfor 1 said controlcircuit,"electroresponsive means iat saidplant connected to said control circu t when" said plant is shut down and' ar-i, rangedwhen energized'to efiect'the startmg 1 oi said plant, switching means at said remote control s'tationr for opening and closin'g said control circuit, contacts in the circuit of said electroresponsive means arranged to be opened in response to predetermined abnormal conditions of 1 said plant, and

trical condition of said machine for discon;

necting said electroresponsive means and contacts from said controlcircuit and source and for Completing a circuit for said electroresponsive means and contacts across said machine.

4. A control system. for a prime mover and a dynamo-electric machine driven thereby comprising a governor for the prime mover, electroresponsive means associated with said governor and havin ,an o crating coil arranged when energize toe ect the starting of said prime mover, contacts arranged t0 adapted to be completed for saidoperating coil and including said contacts, a holdingelectroresponsive means to efiect the starting of said plant, and means for energizing said first-mentioned electroresponsive means from said plant after said plant has been started whereby said control current may be opened and closedto control the operation of said second-mentioned electroresponsive means tovary the output of the plant without efi'ect-. ing the operation of said first-mentioned ellectroresponsive means to shut down the p ant.

6. A control system for a prime mover dynamo-electric plant comprising a governor for the prime mover of the plant, electroresponsive means associated with the overnor and arranged when energized to e ect the starting-of the prime mover, a synchropizing motor-associated with said governor,

' a control circuit adapted to be completed to energize said electroresponsive means and said motor, contacts in the circuit of said electroresponsive means arranged to be opened In response to predetermined abnormal conditions of said plant, and means responsive to a predeterminedelectrical eon- --dition of the dynamo-electric machine for completing across said machine a circuit for i opened in response to abnormal conditions of said machine, a control clrcuit said electroresponsive means which includes said contacts whereby said control circuit may be opened and closed tocont'rol said synchronizing motor without causing said electroresponsive means to efl'ect the stopping of said prime mover.

7. A control system for a prime mover dynamo-electric plant comprising a nor for the prime mover of the plant,e ectroresponsive means associated with the governor having an operating coil arranged when energized to effect the starting of said prime mover, a source of current ata point remote from said plant, a synchronizing m0- tor associated with said governor, a control circuit adapted to be completed to connect said operating coil and said synchronizing motor to said source, contacts in the circuit.

of said operating-coil arranged to be opened in response to predetermined abnormal conditions of said plant, a holding coil for said electroresponsive means, and means responsive to the voltage of a dynamo-electric machine of said-plant for effecting the opening of the circuit between said operating coil and said source and for effecting the completion, of a circuit for said holding coil which includes said contacts and which is energized by the dynamo-electric machine of the plant.

'8. The combination with an electrical translating device having a field-magnet winding, a generator for supplying energy,

to thefield-m'agnet winding and automatic means for initiating and controlling the operation of the translating device, of a source of current for supplying energy to actuate the automatic means only when the generator is not in an energy-dehverlng condition.

' 9. The combination with an electrical.

translating device having a field-magnet winding, a generator for supplying energy to the field-magnet winding, automatic means for initiating and controlling the operation of the translating device and asource of current for supplying energy to actuate the automatic-means when the generator is not in an energy-delivering condition, .of

means for automatically causing the erator to supply energy to actuate the autoering condition.

In witness whereof, I have hereunto Set my hand this 13th day of August,1924.

ELMER F. BLISS.

gen-

"matic means when it is in an energy-deliv 

